Critical Behavior of the Contact Process with Parity Conservation

We introduce a parity conserving version of the contact process, which can be treated using a series expansion technique. Both Pad\'e approximants for the series and numerical simulations for the derivative of the order parameter show that the critical exponent β is consistent with the conjecture β0ex0ex=0ex0ex1. Dynamical Monte Carlo simulations confirm that the model belongs to the branching annihilating random walk with an even number of offsprings universality class.